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Volume 39 Issue 9
Jan.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2021  >  39(9): 131-137,186
ZHOU Yu-qi, CAO Qi, XU Jun-chao, LIU Chang-qing, ZHUO Gui-hua, CHEN Jian-yong, ZHENG Yu-yi. INFLUENCE OF DIFFERENT SOURCE SUBSTRATE SYSTEMS ON METHANOGENESIS OF RESIDUE FROM ANAEROBIC FERMENTATIVE HYDROGEN PRODUCTION USING COMBINED SLUDGE AND FOOD WASTE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 123-130. doi: 10.13205/j.hjgc.202109018
Citation: QIU Jun-jie, ZHENG Liu-gen, CHEN Xiao-yang, CHEN Yong-chun. EFFECTS OF FLY ASH INCORPORATION ON HYDRAULIC CHARACTERISTICS AND AIR PERMEABILITY OF COAL GANGUE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 131-137,186. doi: 10.13205/j.hjgc.202109019
shu

EFFECTS OF FLY ASH INCORPORATION ON HYDRAULIC CHARACTERISTICS AND AIR PERMEABILITY OF COAL GANGUE

doi: 10.13205/j.hjgc.202109019

  • 1. School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China;

  • 2. Anhui Province Engineering Laboratory for Mine Ecological Remediation, Anhui University, Hefei 230601, China;

  • 3. School of Earth and Environment, Anhui University of Science and Technology, Huainan 232000, China;

  • 4. Coal Mining National Engineering Technology Research Institute, Huainan 232000, China

  • Received Date: 2020-08-17
    Available Online: 2022-01-21
    Abstract
  • In order to study the effect of fly ash incorporation on the hydraulic characteristics of coal gangue, nine kinds of mixtures with different mixing ratio of fly ash and coal gangue were analyzed. The indoor one-dimensional fixed head method, a multi-fold pF Meter (DIK-3423) and a falling-pressure method was used to measure the volume of saturated water content, saturated hydraulic conductivity, the soil water characteristic curve(SWCC) and air permeability. The results indicated that:1) adding fly ash could increase the saturated water content of the mixtures, and the saturated water content of the mixture with mixing ratio of 3:7 was 36.9%~41.4%, the closest to the soil; 2) the saturated hydraulic conductivity of the mixture was affected by mixing ratio and bulk density. The saturated hydraulic conductivity decreased with the increase of bulk density, and also with the increase of fly ash's dosage in general. 3) the water retention capability of the mixture decreased with the increase of fly ash dosage. 4) the air permeability of the mixture decreased with the increase of fly ash's dosage. The air permeability of the mixture with fly ash incorporated below 40% had a changing tendency of small to large in sensitivity to water content, and mixture with other composition changed more uniformly. 5) the available water content of the mixture with the mixing ratio of 3:7~2:8 was 17.3%~17.6%, the closest to the soil; when the mixture was used to fill the collapsed land, the mixing ratio could be controlled at 3:7 to ensure suitable available water supply while the permeability was at a lower level. This study could provide data reference for improvement of land reclamation model in the subsidence areas.
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